Ectoparasitic insect pest controllers for animals and their usage

ABSTRACT

Ectoparasitic insect pest controllers for animals, containing hydrazine derivatives of the general formula (I) as the active ingredient, and methods for application of the same: (I) [wherein A is (II), (III), (IV), (V) (wherein R 4  and R 5  are each H, C 1-6 alkyl, or the like; and X is H, or one to five substituents selected from among halogeno and optionally halogenated C 1-6 alkyl groups); R 1  is H or C 1-6 alkyl; R 2  and R 3  are each H, OH, C 1-6 alkyl, phenylcarbonyl, or the like; Y is H, or one to five substituents selected from among halogeno, nitro, and cyano; Z is halogeno, cyano, C 1-6 alkyl, or the like; and W is O or S]. The insect pest controllers exert remarkable controlling effects on parasitic insect pests harmful to domestic or pet animals, e.g. fleas, lice, ticks.

TECHNICAL FIELD

[0001] This invention relates to novel ectoparasitic insect pest controllers for animals containing a hydrazine derivative as the active ingredient, and method for application of the same.

BACKGROUND ART

[0002] The hydrazine derivatives represented by the general formula (I) which are used as an active ingredient of the ectoparasitic insect pest controllers for animals of this invention are known compounds disclosed in JP-A-5-4958, JP-A-5-17428, JP-A-5-32603 and JP-A-5-262712, wherein is mentioned that these compounds, as an agrihorticultural insecticide, have a controlling effect on Lepidopterous insect pests such as diamondback moth (Plutella xylostella (Linnaeus)), rice leafroller (Cnaphalocrosis medinalis (Guenee)), etc.; Hemipterous insect pests such as tea green leafhopper (Empoasca onukii Matsuda), pear lace bug (Stephanitis nashi Esaki et Takeya), etc.; Coleopterous insect pests such as twenty-eight-spotted ladybird (Epilachna vigintioctopunctata (Fabricius)), maize weevil (Sitophilus zeamais Motschulsky), etc.; Dipterous insect pests such as melon fly (Dacus (Zeugodacus) cucurbitae Coquillett), muscid flies (Muscidae), Culex pipiens molestus, etc.; and tylenchid insect pests such as coffee root lesion nematode (Pratylenchus coffeae (Zimmermann) Filipjev et Schuurmans Stekhoven), root-knot nematode (Meloidogyne sp.), etc. However, in the above-mentioned prior arts, neither mention nor suggestion is made as to the insecticidal effect of these compounds on the ectoparasitic insect pests of animals such as insect pests belonging to fleas, lice and ticks.

[0003] A variety of chemicals have so far been proposed as an agent for controlling the ectoparasitic insect pests harmful to bred animals such as domestic and pet animals. However, an agent capable of exhibiting a high controlling effect on the ectoparasitic insect pests at a low dose is not yet known, and creation of such a novel agent is waited for.

[0004] The present inventors have conducted extensive studies with the aim of creating a novel agent exerting a remarkable controlling effect on the ectoparasitic insect pests of domestic and pet animals at a low dose. As a result, it has been found that some of the compounds selected from the hydrazine derivatives described in the above-mentioned prior arts have a remarkable controlling effect on the ectoparasitic insect pests of animals. Based on this finding, this invention has been accomplished.

DISCLOSURE OF THE INVENTION

[0005] This invention relates to an ectoparasitic insect pest controller for animals which contains, as active ingredient thereof, a hydrazine derivative represented by the following general formula (I):

[0006] wherein A represents

[0007] (in this formula, R⁴ represents a hydrogen atom or a C₁₋₆alkyl group; X which may be the same or different represents one to five substituents selected from the group consisting of hydrogen atom, halogen atom, C₁₋₆alkyl group and halo C₁₋₆alkyl group);

[0008] (in this formula, R⁴ and X are as defined above, and R⁵ represents a hydrogen atom, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group which may optionally have one or two, the same or different substituents selected from C₁₋₆alkyl groups);

[0009] (in this formula, R⁴ and X are as defined above), or

[0010] (in this formula, R⁴ and X are as defined above);

[0011] R¹ represents a hydrogen atom or a C₁₋₆alkyl group;

[0012] R² and R³ which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a C₁₋₆alkyl group, a C₁₋₆alkoxy group, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group;

[0013] Y which may be the same or different, represents one to five substituents selected from the group consisting of hydrogen atom, halogen atom, nitro group and cyano group;

[0014] Z represents a halogen atom, a cyano group, a C₁₋₆alkyl group, a halo C₁₋₆alkyl group, a C₁₋₆alkoxy group, a halo C₁₋₆alkoxy group, a halo C₁₋₆alkylthio group, a halo C₁₋₆alkylsulfinyl group or a halo C₁₋₆alkylsulfonyl group; and

[0015] W represents an oxygen atom or a sulfur atom; and to a method for using said insect pest controller.

[0016] The ectoparasitic insect pest controller for animals of this invention exerts a remarkable controlling effect on the parasitic insect pests harmful to domestic and pet animals, such as fleas, lice, ticks, etc.

BEST MODE FOR CARRYING OUT THE INVENTION

[0017] In the definition of the general formula (I) of this invention, “halogen atom” means chlorine atom, bromine atom, iodine atom or fluorine atom; “C₁₋₆alkyl” means a straight or branched chain alkyl group having 1-6 carbon atoms; and “halo C₁₋₆alkyl” means an alkyl group having 1-6 carbon atoms, substituted with at least one halogen atoms which may be the same or different. The hydrazine derivatives represented by the general formula (I) used as an active ingredient of the ectoparasitic insect pesst controller for animals of this invention can be produced according to the production processes mentioned in JP-A-5-4958, JP-A-5-17428, JP-A-5-32603 and JP-A-5-262712.

[0018] Among the hydrazine derivatives of this invention represented by the general formula (I), preferable are the hydrazine derivatives represented by the general formulas (I-1) and (I-2) and, in such preferable compounds, the substituent W is an oxygen atom, the substituent X is a trifluoromethyl group, the substituent Y is a cyano group, the substituent Z is a trifluoromethoxy group, and R¹, R², R³ and R⁴ simultaneously represent a hydrogen atom. As a further preferable compound, for example, (E)-2-[2-(4-cyanophenyl)-1-(3-trifluoromethylphenyl)ethylidene]-N-(4-trifluoromethoxyphenyl)hydrazine carboxamide can be referred to.

[0019] Next, typical examples of the hydrazine derivative represented by the general formula (I) which is an active ingredient of the ectoparasitic insect pest controller for animals of this invention will be shown in the following Tables 1 to 4. This invention, however, is not limited by these compounds. In the tables, Ph means a phenyl group. TABLE 1 General formula (I-1) (I-1)

No R¹ R² R³ R⁴ X Y Z W mp° C.  1 H H H H H H Cl O 199  2 H H H H H H OCF₃ O 149  3 H H H H H 4-Cl Cl O 206  4 H H H H H 4-Cl OCF₃ O 197  5 H H H H H 4-CN Cl O 217  6 H H H H H 4-CN Cl S 128  7 H H H H H 4-CN OCF₃ S 116  8 H H H H H 4-CN OCF₃ O 214 E-form  9 H H H H H 4-CN OCF₃ O 159 Z-form 10 H H H H H 4-NO₂ Cl O 222 11 H H H H H 4-NO₂ Cl S 206 12 H H H H H 4-NO₂ OCF₃ O 189 13 H H H H H 4-NO₂ OCF₃ S 139 14 H H H H H 4-NO₂ SCF₃ O 200 15 H H H H 3-Cl H OCF₃ O 212 16 H H H H 3-Cl 4-Cl OCF₃ O 201 17 H H H H 3-Cl 4-CN Cl O 206 18 H H H H 3-Cl 4-CN OCF₃ O 187 E-form 19 H H H H 3-Cl 4-CN OCF₃ O 148 Z-form 20 H H H H 3-Cl 4-CN OCF₃ S 199 21 H H H H 3-Cl 4-CN SCF₃ O 215 22 H H H H 3-Cl 4-CN SOCF₃ O 205 23 H H H H 3-Cl 4-CN SO₂CF₃ O 212 24 H H H H 3-Br H Cl O 191 25 H H H H 3-Br H OCF₃ O 209 26 H H H H 3-Br 4-CN Cl O 205 27 H H H H 3-Br 4-CN OCF₃ O 176 28 H H H H 3-Br 4-CN SCF₃ O 206 29 H H H H 3-Br 4-CN SCF₃ O 216 30 H H H H 3-Br 4-CN SO₂CF₃ O 215 31 H H H H 3-F H Cl O 206 32 H H H H 3-F H OCF₃ O 200 33 H H H H 3-F 4-Cl OCF₃ O 191 34 H H H H 3-F 4-Cl Cl O 208 35 H H H H 3-F 4-CN OCF₃ O 202 36 H H H H 3-I 4-CN Cl O 213 37 H H H H 3-I 4-CN OCF₃ O 201 38 H H H H 3-CH₃ H Cl O 185 39 H H H H 3-CH₃ H OCF₃ O 198 40 H H H H 3-CH₃ 4-CN Cl O 200 41 H H H H 3-CH₃ 4-CN OCF₃ O 189 42 H H H H 3-CF₃ H Cl O 206 43 H H H H 3-CF₃ H OCF₃ O 210 44 H H H H 3-CF₃ 4-CN OCF₃ O 191 45 H H H H 3-CF₃ 4-CN OCF₃ S 149 46 CH₃ H H H H H Cl O 132 47 CH₃ H H H H H OCF₃ O 108 48 H CH₃ H H H H Cl O 98 49 H CH₃ H H H H Br O 85 50 H CH₃ H H H H OCF₃ O 115 EZ-form 51 H CH₃ H H H H OCF₃ O 95 E-form 52 H CH₃ H H H H OCF₃ O 66 Z-form 53 H CH₃ H H H 4-Cl Cl O 121 54 H CH₃ H H H 4-Cl OCF₃ O 105 55 H CH₃ H H 3-Cl 4-CN Cl O 140 56 H CH₃ H H 3-Cl 4-CN OCF₃ O 98 57 H H OH H H H Cl O 188 58 H H OH H H H OCF₃ O 170 59 H H OH H H 4-Cl Cl O Viscous material 60 H H OH H H 4-Cl OCF₃ O 185 E-form 61 H H OH H H 4-Cl OCF₃ O 95 Z-form 62 H H OH H H 4-CN Cl O Viscous material 63 H H OH H H 4-CN OCF₃ O 113 64 H H CH₃ H H H Cl O 164 65 H H CH₃ H H H OCF₃ S 118 66 H H OCH₃ H H H Cl O 183 67 H H OCH₃ H H H OCF₃ O 181 68 H H C₃H₇-i H H H Cl O 155 69 H H C₃H₇-i H H H OCF₃ O 193 70 H H OC₄H₉-i H H H Cl O 176 71 H H OC₄H₉-i H H H OCF₃ O 184 72 H H O—CO—CH₃ H H H OCF₃ O 182 73 H H O—CO—Ph H H H OCF₃ O 168 74 H H OH CH₃ H H Cl O 115 75 H H OH CH₃ H H OCF₃ O 130 76 H H H H 3-F 4-CN SCF₃ O 214 77 H H H H 3-F 4-CN SOCF₃ O 214 78 H H H H 4-F 4-CN SO₂CF₃ O 165 79 H H H H 3-Cl 4-CN SOCF₃ O 157 80 H H H H 3-CF₃ 4-CN SCF₃ O 215 81 H H H H 3-CF₃ 4-CN SOCF₃ O 210 82 H H H H 3-CF₃ 4-CN OCF₃ O 152 Z-form 83 H H H H 3-CF₃ 4-CN Cl O 165

[0020] TABLE 2 General Formula (I-2) (I-2)

(R¹ and R³ are hydrogen atoms.) No R² R⁴ R⁵ X Y Z W mp° C. 84 H H H H H Cl O 211 85 H H H H H OCF₃ O 194 86 H H H H 4-Cl OCF₃ O 209 87 H H H H 4-CN OCF₃ O 204 88 H H H H 4-NO₂ OCF₃ O 203 89 H H H 3-F 4-Cl OCF₃ O 203 90 H H H 3-Cl 4-Cl OCF₃ O 176 91 H H H 3-Cl 4-CN OCF₃ O 193 92 H H H 3-Cl 4-CN SCF₃ O 177 93 H H H 3-Cl 4-CN SOCF₃ O 178 94 H H H 3-Cl 4-CN SO₂CF₃ O 170 95 H H H 3-Br 4-CN OCF₃ O 187 96 H H H 3-CF₃ 4-CN OCF₃ O 165 97 H H H 3-CF₃ 4-CN SCF₃ O 164 98 H H H H 4-Cl OCF₃ S 171 99 H H H 3-Cl 4-CN OCF₃ S 149 100 H H H 3-CF₃ 4-CN OCF₃ S 209 101 H H CO—CH₃ 3-Cl 4-CN OCF₃ O 178 102 H H CO—Ph 3-Cl 4-CN OCF₃ O 221 103 H H CONHC₂H₅ 3-Cl 4-CN OCF₃ O 201 104 H OH H H H OCF₃ O 190 105 H OCH₃ H H H Cl O 195 106 H OCH₃ H H H OCF₃ O 183 107 H OCH₃ H H H OCF₃ O 186 108 CH₃ H H 3-Cl 4-CN OCF₃ O 156 109 H H H H 4-F OCF₃ O 209 110 H H H H 4-Br Cl O 233 111 H H H H 4-Br OCF₃ O 201 112 H H H H 3-CN OCF₃ O 176 113 H H H H 2-NO₂ OCF₃ O 197 114 H H H 3-F 4-CN OCF₃ O 189 115 H H H 3-F 4-CN SCF₃ O 189 116 H H H 3-F 4-CN SOCF₃ O 166 117 H H H 3-CF₃ 4-CN OCF₃ O 131 −Isomer 118 H H H 3-CF₃ 4-CN OCF₃ O 126 +Isomer 119 H H H 3-CF₃ 4-CN SOCF₃ O Glassy material 120 H H H 3-CF₃ 4-CN SO₂CF₃ O Glassy material 121 H H H H 3-CN OCF₃ O 120

[0021] TABLE 3 General formula (I-3) (I-3)

(In this table, R² and R³ are hydrogen atoms, and W is an oxygen atom.) mp° C. No R¹ R⁴ X Y X Refractive index 122 H H H H OCF₃ 113.3-114.0 123 H H H 4-Cl OCF₃ 137.8 124 H H H 4-CN Cl 163 125 H H H 4-CN OCF₃ 138 126 H H 3-Cl 4-Cl Cl 143.5-144.0 127 H H 3-Cl 4-Cl OCF₃ 139.6-141.5 128 H H 3-Cl 4-NO₂ Cl 174.0-176.5 129 H H 3-Cl 4-NO₂ OCF₃ 151.6-151.7 130 H H 3-Cl 4-CN Cl 191.0-192.0 131 H H 3-Cl 4-CN OCF₃ 160.5-162.0 132 H H 3-Cl 4-CN SCF₃ 188.0 133 H H 3-Cl 4-CN SOCF₃ 206.1 134 H H 3-F 4-CN Cl 154-156 135 H H 3-F 4-CN OCF₃ 155.9-156.8 136 H H 3-CH₃ 4-CN Cl 127 137 H H 3-CH₃ 4-CN OCF₃ 166 138 H H 3-CF₃ 4-CN Cl 164-165 139 H H 3-CF₃ 4-CN OCF₃ 151.0 140 H CH₃ 3-Cl 4-CN OCF₃ nD 1.5950(25° C.) 141 CH₃ H 3-CF₃ 4-CN Cl 209-211 142 H H 3-Cl 2-CN OCF₃ 148

[0022] TABLE 4 General formula (I-4) (I-4)

(In this formula, R¹, R², R³ and R⁴ are hydrogen atoms, and W is an oxygen atom.) mp° C. No X Y Z Refractive index 143 H H OCF₃ 51.0-53.0 144 H 4-Cl OCF₃ 92.1 145 H 4-CN Cl 106-108 146 H 4-CN OCF₃ nD 1.5685 (27° C.) 147 3-Cl 4-Cl Cl 105.3-106.4 148 3-Cl 4-Cl OCF₃ 38.0 149 3-Cl 4-NO₂ Cl Viscous material 150 3-Cl 4-NO₂ OCF₃ Viscous material 151 3-Cl 4-CN Cl 153.1 152 3-Cl 4-CN OCF₃ 43.5-45.0 153 3-F 4-CN Cl 164-165 154 3-F 4-CN OCF₃ nD 1.5615 (27° C.) 155 3-CH₃ 4-CN Cl 138-139 156 3-CH₃ 4-CN OCF₃ nD 1.5315 (28° C.) 157 3-CF₃ 4-CN Cl 43 158 3-CF₃ 4-CN OCF₃ 153.1

[0023] Some of the compounds shown in Tables 1 to 4 are viscous substances or glassy substances. ¹H-NMR date of these compounds are shown in Table 5. No ¹H-NMR [CDCl₃/TMS, δ value (ppm)] 59 6.29(s, 1H), 7.65-7.92(m, 13H), 9.14(bs, 1H), 10.70(bs, 1H). (DMSO-d₆) 62 3.88(bs, 1H), 3.87(s, 1H), 6.91-7.55(m, 13H), 7.73(s, 1H), 8.13(bs, 1H). 119 3.12(dd, 1H), 3.23(dd, 1H), 4.12-4.32(m, 2H), 6.13(bs, 1H), 7.24-7.93(m, 12H), 8.08(bs, 1H). 120 3.11(dd, 1H), 3.23(dd, 1H), 4.13-4.28(m, 2H), 5.97(s, 1H), 7.25-7.75(m, 12H), 7.90-8.00(bs, 1H). 149 3.65(d, 2H), 4.20(t, 1H), 4.70(s, 2H), 6.85(dd, 1H), 6.93(dd, 1H), 7.08(dd, 1H), 7.15- 7.21 (m, 3H), 7.24(d, 2H), 7.40(d, 2H), 8.13(d, 2H), 8.40 (s, 1H). 150 3.64(s, 2H), 4.69(s, 2H), 6.84(dd, 1H), 6.94 (dd, 1H), 7.09(m, 3H), 7.23(t, 1H), 7.29(d, 2H), 7.40(d, 2H), 8.12(d, 2H), 8.40(s, 1H).

[0024] The ectoparasitic insect pest controller for animals of this invention can be used for domestic animals such as cattle, horse, sheep, etc.; and pets such as dog, cat, etc.; as well as for Rodential animals such as mouse, rat, hamster, squirrel, etc.; Lagomorphous animals, Carnivorous animals such as ferret, etc.; and birds such as duck, chicken, pigeon, etc. As the ectoparasitic pest insects of these animals, for example, the insects belonging to fleas such as cat flea (Ctenocephalides felis), dog flea (Ctenocephalides canis), oriental rat flea (Xenopsylla cheopis), etc.; the insects belonging to ticks such as Haemaphysalis longicornis, (Boophilus microplus), etc.; and cattle tick the insects belonging to lice such as cattle louse (Haematopinus eurysternus), sheep louse (Damalinia ovis), etc. can be referred to.

[0025] For an effective use of the ectoparasitic insect pest controllers for animals of this invention represented by the general formula (1), the controller is compounded with an appropriate solid carrier and/or liquid carrier and, if necessary, adjuvants and the like in an appropriate proportion according to the conventional recipe in the drug making and fixed on the carriers by dissolution, suspension, mixing, impregnation, adsorption or adhesion. The resulting mixture is formed into an appropriate preparation form such as liquid preparation, emulsion, cream, ointment, suspension, aerosol, etc. according to the purpose of the use, and then the formed preparation is put to use.

[0026] The solid or liquid carriers used in this invention may be the carriers conventionally used for agents for animals. From the viewpoint of easiness of treatment on the objective animals, the use of liquid carriers is preferable. As examples of the liquid carrier, alcohols such as methyl alcohol, ethyl alcohol, isopropyl alcohol, tertiary butyl alcohol, benzyl alcohol and the like; propylene carbonate; N-methyl-2-pyrrolidone; water, etc. can be referred to.

[0027] According to the need, adjuvants can be incorporated into the controller of this invention. As the adjuvants, surfactants, antioxidants, emulsifiers, etc. can be referred to. More specific examples of the adjuvants include surfactants such as polyoxyethylene alkylaryl ether, polyoxyethylene sorbitan monolaurate, alkylaryl sorbitan monolaurate, alkylbenzenesulfonates, alkylnaphthalene-sulfonic acid, ligninsulfonic acid salts, higher alcohol sulfate salts, glycol monoalkyl ethers, glycols, and the like; emulsifiers such as sorbitan monooleate, sorbitan monolaurate, caprylic acid monoglyceride, capric acid monoglyceride, isostearic acid monoglyceride, propylene glycol monocaprylate, etc; and antioxidants such as BHA, BHT, etc.

[0028] The ectoparasitic insect pest controller composition for animals of this invention can contain the insect pest controller of this invention as an active ingredient in an amount of 0.01-80.0% by weight per 100 parts by weight of the present composition.

[0029] The methods for using the ectoparasitic insect pest controller for animals of this invention include a pot-on treatment which comprises dropping a liquid agent onto the skin of the back shoulder region of the objective animal and thereby controlling the ectoparasitic insect pest; and a local treatment such as pore-on which comprises applying a liquid agent along the back center line of the objective animal and the allowing the applied agent to diffuse on the body surface and thereby controlling the ectoparasitic insect pest; as well as a treatment method of supporting the agent on a collar or the like from which the agent is released; a treatment method of directly coating a liquid agent or an ointment onto the body surface; a treatment method of applying an aerosol of a liquid agent by means of spray or the like; etc. The dose of the agent may be appropriately selected from a range of about 0.1 to 500 mg as expressed in terms of active ingredient compound, and from a range of about 0.01 to 20 ml as expressed in terms of the insect pest controller of this invention, both per kilogram of body weight of the objective animal.

[0030] According to the need, the ectoparasitic insect pest controller for animals of this invention may be used in combination with other active ingredients. As said “other active ingredient”, for example, the following can be referred to:

[0031] pyrethroid compounds such as permethrin, phenothrin, allethrin, pyrethrin, prallethrin, cyphenothrin, cyfluthrin, fenvalerate, fenpropathrin, transfluthrin, etc.;

[0032] organic phosphorus compounds such as dichlorvos, tetrachlorvinphos, fenthion, chlorpyrifos, diazinon, etc.;

[0033] N-phenylpyrazole compounds such as fipronil, etc.;

[0034] carbamate compounds such as propoxur, carbaryl, metoxadiazone, fenocarb, etc.;

[0035] neonicotinoid compounds; etc.

EXAMPLES Example 1

[0036] A compound shown in Tables 1-4  5 parts Hexylene glycol 50 parts Isopropanol 45 parts

[0037] The above-mentioned ingredients were uniformly mixed and dissolved together to obtain a liquid formulation.

Example 2

[0038] A compound shown in Tables 1-4 10 parts Polyoxyethylene styrylphenyl ether 10 parts Cylohexanone 80 parts

[0039] The above-mentioned ingredients were uniformly mixed and dissolved together to obtain an emulsifier.

Test Example 1

[0040] A spot-on agent was prepared by mixing and dissolving 10 parts by weight of Compound 44 or Compound 96 in 90 parts by weight of diethylene glycol monoethyl ether. One day before the day of administration, 30 fleas [adult worm of cat flea (Ctenocephalides felis)] were made to parasitize a cat, and the cat was let wear an Elizabeth collar on the neck. Then, 0.4 ml of a test agent was applied to the skin of back shoulder area of the cat (alive body weight 3.2 kg). One day after and three days after the treatment using the agent, the number of parasitic fleas was counted by means of a flea-catching comb. After counting the number of parasitic fleas, the whole fleas were again made to parasitize the cat. As a blank test, fleas were made to parasitize an untreated cat in the same manner as above, and the number of parasitic fleas was counted. The controlling rate was calculated according to the following formula, and the result was judged according to the criterion shown below. ${{Controlling}\quad {rate}\quad (\%)} = {\frac{\begin{matrix} {{Parasitic}\quad {rate}} \\ {{in}\quad {untreated}} \\ {group} \end{matrix} - \begin{matrix} {{Parasitic}\quad {rate}} \\ {{in}\quad {treated}} \\ {group} \end{matrix}}{\begin{matrix} {{Parasitic}\quad {rate}\quad {in}} \\ {{untreated}\quad {group}} \end{matrix}} \times 100}$

Criterion of judgement Controlling rate (%) A 100 B 99-90 C 89-80 D 79-50

[0041] Thus, both the ectoparasitic insect pest controllers for animals containing Compound No. 44 and Compound No. 96 of this invention gave a judgement of A. 

1. (Amended) An ectoparasitic insect pest controller for animals which contains, as active ingredient thereof, a hydrazine derivative represented by the following general formula (I):

wherein A represents

(in this formula, R⁴ represents a hydrogen atom or a C₁₋₆alkyl group; X which may be the same or different represents one to five substituents selected from the group consisting of hydrogen atom, halogen atom, C₁₋₆alkyl group and halo C₁₋₆alkyl group);

(in this formula, R⁴ and X are as defined above, and R⁵ represents a hydrogen atom, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group which may optionally have one or two, the same or different substituents selected from C₁₋₆alkyl groups);

(in this formula, R⁴ and X are as defined above), or

(in this formula, R⁴ and X are as defined above); R¹ represents a hydrogen atom or a C₁₋₆alkyl group; R² and R³ which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a C₁₋₆alkyl group, a C₁₋₆alkoxy group, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group; Y which may be the same or different, represents one to five substituents selected from the group consisting of hydrogen atom, halogen atom, nitro group and cyano group; Z represents a halogen atom, a cyano group, a C₁₋₆alkyl group, a halo C₁₋₆alkyl group, a C₁₋₆alkoxy group, a halo C₁₋₆alkoxy group, a halo C₁₋₆alkylthio group, a halo C₁₋₆alkylsulfinyl group or a halo C₁₋₆alkylsulfonyl group; and W represents an oxygen atom or a sulfur atom, provided that when A is

then Y is not a hydrogen atom and 4-fluorine atom.
 2. (Amended) An ectoparasitic insect pest controller for animals according to claim 1, represented by the following general formula (I-1):

wherein R¹ represents a hydrogen atom or a C₁₋₆alkyl group; R² and R³ which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a C₁₋₆alkyl group, a C₁₋₆alkoxy group, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group; R⁴ represents a hydrogen atom or a C₁₋₆alkyl group; X which may be the same or different represents 1-5 substituents selected from the group consisting of hydrogen atom, halogen atom, C₁₋₆alkyl group and halo C₁₋₆alkyl group; Y which may be the same or different represents 1-5 substituents selected from the group consisting of halogen atom other than 4-fluorine atom, nitro group and cyano group; Z represents a halogen atom, a cyano group, a C₁₋₆alkyl group, a halo C₁₋₆alkyl group, a C₁₋₆alkoxy group, a halo C₁₋₆alkoxy group, a halo C₁₋₆alkylthio group, a halo C₁₋₆alkylsulfinyl group or a halo C₁₋₆alkylsulfonyl group; and W represents an oxygen atom or a sulfur atom.
 3. An ectoparasitic insect pest controller for animals according to claim 1, represented by the following general formula (I-2):

wherein R¹ represents a hydrogen atom or a C₁₋₆alkyl group; R² and R³ which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a C₁₋₆alkyl group, a C₁₋₆alkoxy group, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group; R⁴ represents a hydrogen atom or a C₁₋₆alkyl group; R⁵ represents a hydrogen atom, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group which may optionally have one or two, the same or different substituents selected from C₁₋₆alkyl groups; X which may be the same or different represents 1-5 substituents selected from the group consisting of hydrogen atom, halogen atom, C₁₋₆alkyl group and halo C₁₋₆alkyl group; Y which may be the same or different represents 1-5 substituents selected from the group consisting of hydrogen atom, halogen atom, nitro group and cyano group; Z represents a halogen atom, a cyano group, a C₁₋₆alkyl group, a halo C₁₋₆alkyl group, a C₁₋₆alkoxy group, a halo C₁₋₆alkoxy group, a halo C₁₋₆alkylthio group, a halo C₁₋₆alkylsulfinyl group or a halo C₁₋₆alkylsulfonyl group; and W represents an oxygen atom or a sulfur atom.
 4. An ectoparasitic insect pest controller for animals according to claim 1, represented by the following general formula (I-3):

wherein R¹ represents a hydrogen atom or a C₁₋₆alkyl group; R² and R³ which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a C₁₋₆alkyl group, a C₁₋₆alkoxy group, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group; R⁴ represents a hydrogen atom or a C₁₋₆alkyl group; X which may be the same or different represents 1-5 substituents selected from the group consisting of hydrogen atom, halogen atom, C₁₋₆alkyl group and halo C₁₋₆alkyl group; Y which may be the same or different represents 1-5 substituents selected from the group consisting of hydrogen atom, halogen atom, nitro group and cyano group; Z represents a halogen atom, a cyano group, a C₁₋₆alkyl group, a halo C₁₋₆alkyl group, a C₁₋₆alkoxy group, a halo C₁₋₆alkoxy group, a halo C₁₋₆alkylthio group, a halo C₁₋₆alkylsulfinyl group or a halo C₁₋₆alkylsulfonyl group; and W represents an oxygen atom or a sulfur atom.
 5. An ectoparasitic insect pest controller for animals according to claim 1, represented by the following general formula (I-4):

wherein R¹ represents a hydrogen atom or a C₁₋₆alkyl group; R² and R³ which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a C₁₋₆alkyl group, a C₁₋₆alkoxy group, a C₁₋₆alkylcarbonyl group or a phenylcarbonyl group; R⁴ represents a hydrogen atom or a C₁₋₆alkyl group; X which may be the same or different represents 1-5 substituents selected from the group consisting of hydrogen atom, halogen atom, C₁₋₆alkyl group and halo C₁₋₆alkyl group; Y which may be the same or different represents 1-5 substituents selected from the group consisting of hydrogen atom, halogen atom, nitro group and cyano group; Z represents a halogen atom, a cyano group, a C₁₋₆alkyl group, a halo C₁₋₆alkyl group, a C₁₋₆alkoxy group, a halo C₁₋₆alkoxy group, a halo C₁₋₆alkylthio group, a halo C₁₋₆alkylsulfinyl group or a halo C₁₋₆alkylsulfonyl group; and W represents an oxygen atom or a sulfur atom.
 6. A method for using an ectoparasitic insect pest controller for animals, characterized by treating the body surface of an animal with an effective quantity of the ectoparasitic insect pest controller for animals according to any one of claims 1-5. 